Tuesday
September 30, 2014

Posts by Yamy


Total # Posts: 9

Chemistry
How did you get the answer? or what is your answer?
December 15, 2012

Chemistry
Step 1: (0.5*9110.0 - 9110.0)/ (200.5 - 9110.0)= erf(ξ) Step 2: erf(ξ < 0.6), use the approximation erf ξ = ξ Step 3: t= d^2/4*D*ξ^2 d=88.5 x 10-2 cm D=3.091 x 10-7 cm2/s Step 4: t in sec -> hours Conversion seconds to hours is total/(60x60)
December 15, 2012

Chemistry
Step 1: (0.5*9110.0 - 9110.0)/ (200.5 - 9110.0)= erf(ξ) Step 2: erf(ξ < 0.6), use the approximation erf ξ = ξ Step 3: t= d^2/4*D*ξ^2 d=88.5 x 10-2 cm D=3.091 x 10-7 cm2/s Step 4: t in sec -> hours Conversion seconds to hours is total/(60x60)
December 15, 2012

CHEMISTRY
5.00*10^22 / (gallium level*10^-8)
December 14, 2012

Chemistry
I agree I) is wrong
December 14, 2012

Chemistry
Same here, can anyone show how to insert the data into the formulas. Thank you
December 14, 2012

Chemistry
Step 1: (0.5*7865 - 7865)/ (193.5 - 7865)= 0.512611614417(erf(ξ)) Step 2: erf(ξ < 0.6), use the approximation erf ξ = ξ Step 3: t= d^2/4*D*ξ^2 t=(59.0x10^-2)^2/4(3.091 x 10^-7)(0.512611614417)^2 t=0.3481/3.2488965297e-07 t=1071440.70862 d=59.0 x 10-...
December 14, 2012

Chemistry
Could someone fill the data above into the formula, so we can get an idea how to search the answer? Thank you
December 14, 2012

Chemistry
Don't think its a correct answer!
December 14, 2012

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